﻿#region License

// Another free, open solution by someone who gets it.
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#endregion

using System;
using System.Collections.Generic;

namespace Patterns.Validation.Formatting
{
	internal class DateTimeValueFormatter : IValueFormatter
	{
		#region IValueFormatter Members

		public bool CanHandle(object value)
		{
			return (value is DateTime);
		}

		public string ToString(object value, int nestedPropertyLevel = 0)
		{
			var dateTime = (DateTime) value;

			var fragments = new List<string>();

			if (HasDate(dateTime))
				fragments.Add(dateTime.ToString("yyyy-MM-dd"));

			if (HasTime(dateTime))
				fragments.Add(dateTime.ToString("HH:mm:ss"));

			return "<" + string.Join(" ", fragments.ToArray()) + ">";
		}

		#endregion

		private static bool HasTime(DateTime dateTime)
		{
			return (dateTime.Hour != 0) || (dateTime.Minute != 0) || (dateTime.Second != 0);
		}

		private static bool HasDate(DateTime dateTime)
		{
			return (dateTime.Day != 1) || (dateTime.Month != 1) || (dateTime.Year != 1);
		}
	}
}